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You will also need to install the Drupal Apache Solr module (https://drupal.org/project/apachesolr).  The Drupal Apache Solr module installation says to copy it's its Solr configuration files to the Solr configuration directory, . Do not do this as you will be overwriting your existing Islandora Solr configuration.  Instead update the existing schema.xml file with the required Drupal fields (it's good practice to backup any files before you edit them if they are not already under a vcs, even better try it on a dev/test install first).

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